Phenomenology 2023 Symposium

Session

Cosmology I

8 May 2023, 14:15

University of Pittsburgh

Conveners

Cosmology I

• Jay Hubisz (Syracuse University)

41. Cornering Extended Starobinsky Inflation with CMB and SKA

Benedikt Schosser (Heidelberg University)

08/05/2023, 14:15

Starobinsky inflation is an attractive, fundamental model to
explain the Planck measurements, and its higher-order extension may
allow us to probe quantum gravity effects. We show that future CMB
data combined with the 21cm intensity map from SKA will meaningfully
probe such an extended Starobinsky model. A combined analysis will
provide a precise measurement and intriguing...

75. Gauged quintessence

Jiheon Lee (KAIST)

08/05/2023, 14:30

We introduce the gauged quintessence model, in which the dark energy field (quintessence) has a U(1) gauge symmetry. This is the first quintessence model under a gauge symmetry. We identify the real part of the complex scalar as the dark energy field (quintessence), while the imaginary part is the longitudinal component of a new gauge boson. It brings interesting characters to dark energy...

85. Seeing highly anisotropic gravitational wave backgrounds from phase transitions

Arushi Bodas

08/05/2023, 14:45

Anisotropies of gravitational wave background (GWB) from a first-order phase transition could provide a new map of primordial inhomogeneities, analogous to the CMB. In multi-field inflation, this map could differ significantly from CMB if its inhomogeneities are sourced by a quantum field different from the one sourcing CMB (adiabatic) inhomogeneities. While a highly anisotropic GWB could...

238. Enhancing CMB acoustic phase shift with dark matter loading

Daven Wei Ren Ho

08/05/2023, 15:00

The acoustic peaks in the CMB power spectrum contain valuable information for studying particle physics. A shift in the position of these peaks corresponds to a phase shift in the acoustic oscillations of the photon-baryon fluid before recombination, which only corresponds to specific types of dark sector physics. As such, it provides a clean cosmological signature for identifying new physics...

202. Cosmic Stasis from Primordial-Black-Hole Evaporation and Its Phenomenological Implications

Brooks Thomas

08/05/2023, 15:30

Cosmic stasis is a phenomenon in which the abundances of multiple cosmological energy components — components such as matter, radiation, or vacuum energy — remain effectively constant despite the expansion of the universe. One mechanism which can give rise to an extended period of cosmic stasis is the evaporation of a population of primordial black holes (PBHs). In this talk, I review how...

192. Chiral Plasma Instability in the Early Universe

Tina Kahniashvili

08/05/2023, 15:45

In my talk I will address possible parity symmetry violation as manifested through prefered chirality in the early universe and its imprints on cosmological observables. I will discuss the chiral plasma instability (CPI) induced in primordial plasma and driven by chiral magnetic effect. My particular interest will be to estimate the gravitational wave signal sourced by CPI and to determine its...